keep的被动语态keep sb doing怎么改被动语态?请例句示范另外,Mr.Li keeps us interes

keep sb doing怎么改被动语态?请例句示范
-> A girl is kept doing nothing in a shop.女孩在店铺里被安排闲着.
另外,Mr.Li keeps us interested in Maths.
可以改成:We are kept to be interested in Maths.为什么?
-> We are kept interested in Maths.by Mr.Li.
-> 因为 keep + to be 不是词语之正常搭配,而且原文是 keeps us interested 并不是 keeps us to be interested ,所以不用 We are kept to be interested in Maths.
-> 词语之正常搭配是 keep + 动词-ing
-> 参考资料列出更多的例子.